• International journal of advanced smart convergence
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• 제13권2호
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• pp.88-93
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• 2024

The main problem with existing edge detection techniques is that they have many limitations in detecting edges for complex and diverse images that exist in the real world. This is because only edges of a defined shape are discovered based on an accurate definition of the edge. One of the methods to solve this problem is the cost minimization method. In the cost minimization method, cost elements and cost functions are defined and used. The cost function calculates the cost for the candidate edge model generated according to the candidate edge generation strategy, and if the cost is found to be satisfactory, the candidate edge model becomes the edge for the image. In this study, we proposed an enhanced candidate edge generation strategy to discover edges for more diverse types of images in order to improve the shortcoming of the cost minimization method, which is that it only discovers edges of a defined type. As a result, improved edge detection results were confirmed.

• 전기전자학회논문지
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• 제22권2호
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• pp.455-459
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• 2018

In this paper, proposed a multi-channel charging control strategy for electric vehicle. This control strategy can adjust the charging power according to the calculated state-of-charge (SOC). Electric vehicle (EV) charging system using Particle Swarm Optimization (PSO) algorithm is proposed. A stochastic optimization algorithm technique such as PSO in the time-of-use (TOU) price used for the energy cost minimization. Simulation results show that the energy cost can be reduced using proposed method.

• 사물인터넷융복합논문지
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• 제8권1호
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• pp.59-64
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• 2022

기존의 모서리 감지 기법들은 모서리에 대한 정확한 정의를 바탕으로 하여 정의된 형태의 모서리만을 발견하기 때문에 현실 세계에 존재하는 복잡하고 다양한 형태의 이미지에 대한 모서리를 발견하는데 많은 제약이 따른다. 이러한 문제점을 해결하여 다양한 형태의 모서리를 발견하기 위한 방법이 비용최소화 방법이다. 이 방법에서는 비용함수 및 비용요소를 정의하여 사용하며, 이 비용함수는 후보 모서리 생성 전략에 따라 생성되는 후보 모서리 모형에 대한 비용을 계산하여 만족할 만한 결과가 나타나게 되면 해당 후보 모서리 모형이 해당 이미지에 대한 모서리가 된다. 본 연구에서는 비용최소화 방법의 문제점인 정의된 형태의 모서리만을 발견한다는 단점을 개선하기 위해 좀 더 다양한 형태의 이미지에 대한 모서리를 발견하기 위한 후보 모서리 생성 전략을 제안하였다. 또한 이러한 점을 반영한 간단한 모의실험을 통해 개선 내용을 확인하였다.

• 산업경영시스템학회지
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• 제20권43호
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• pp.139-144
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• 1997

The objective of this study is to establish an actual optimization strategy for the traditional multi-stage distribution system which consists of factory warehouse, central distribution warehouse, and regional distribution warehouse under the basic assumption of distribution system. A minimization algorithm of total operating cost in a multi-stage distribution system was developed by expanding the previously existing algorithm through consideration of additional transportation environment. Alternative non-linear transportation costs for the same travel distance can be applied for the multi-stage distribution system by estimating the corresponding characteristic values through the collection of the actual data representing the change of transportation circumstances.

• 한국소음진동공학회논문집
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• 제20권1호
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• pp.83-91
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• 2010

In this paper, the feasibility of the cost function having two control factors were discussed in compared to two others which has one different control factor respectively. As of the control factors, the dynamic response of a discrete system and the vibrational intensity at the reference point which is the connecting point of a discrete system to a flexible beam were controlled actively by the control force obtained from the minimization of the cost function. The method of feedforward control was employed for the control strategy. The reduction levels of the dynamic response of a discrete system and the vibrational intensity at a reference point, and also the input power induced by the control force were evaluated numerically in cases of the three different cost functions. In comparison with the results obtained from the cost functions of one control factor, which is the dynamic response or the vibrational intensity, in most cases of the cost function of two control factors the better or similar results were obtained. As a conclusion, it is surely noted that both the dynamic response and the vibrational intensity of the vibrating system be controlled up to the expected level by using the single cost function having two control factors.

• Nuclear Engineering and Technology
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• 제23권1호
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• pp.20-29
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• 1991

본 연구에서는 2030년까지의 전력수요, 전력생산중 원자력발전의 비중, 기존 원전표준화 계획, 국내제작 능력을 반영하여 개량형 경수로와 중수로 (CANDU)에 대한 참조 시나리오를 도출하고 각 참조 시나리오와 핵연료주기 전략별 핵연류주기 비용, 원자력 발전 단가, 우라늄 소요량, 인력 소요량을 계산하였다. 참조 시나리오들에 대한 분석을 한 결과 우라늄 자원활용, 원전안전성, 인력활용 측면이 노형 전략수립의 주요 인자로 작용하며 발전단가는 전략별로 큰 차이가 없는 것으로 나타났다.

• Industrial Engineering and Management Systems
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• 제9권2호
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• pp.70-79
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• 2010

Makespan and cost minimization are two important factors in project investment. This paper considers a multi-mode resource-constrained project scheduling problem with the objective of minimizing costs, subject to a deadline constraint. A number of studies have focused on minimizing makespan or resource availability cost with a specified deadline. This problem assumes a fixed cost for the availability of each renewable resource per period, and the project cost to be minimized is the sum of the variable cost associated with the execution mode of each activity. The presented memetic algorithm (MA) consists of three features: (1) a truncated branch and bound heuristic that serves as effective preprocessing in forming the initial population; (2) a strategy that maintains two populations, which respectively store deadline-feasible and infeasible solutions, enabling the MA to explore quality solutions in a broader resource-feasible space; (3) a repair-and-improvement local search scheme that refines each offspring and updates the two populations. The MA is tested via ProGen generated instances with problem sizes of 18, 20, and 30. The experimental results indicate that the MA performs exceptionally well in both effectiveness and efficiency using the optimal solutions or the current best solutions for the comparison standard.

• 한국경영과학회지
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• 제15권1호
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• pp.83-97
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• 1990

We consider an insured who wishes to determine his optimal reporting strategy over a given planning horizon, when he has option of reporting of not reporting his at-fault accidents. Assuming that the premium in future period is continually adjusted by the insured's loss experience, the insured would not report every loss incurred. Rather, considering the benefits and costs of each decision, the insured may want to seek a way of optimizing his interests over the planning horizon. The situation is modeled as a dynamic programming problem. We consider an insured's discounted expected cost minimization problem, where the premium increase in future period is affected by the size of the current claim. More specifically, we examine two cases ; (1) the premium increase in the next is a linear function (a constant fraction) of the current claim size; (2) the premium increase in the next period is a concave function of the current claim size. In each case, we derive the insured's optimal reporting strategy.

• 아태비즈니스연구
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• 제9권3호
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• pp.71-82
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• 2018

This study verifies whether the sustainable tax strategy provides unique information on earnings persistence and brings about the difference of value relevance of accounting information. Sustainability is measured by the 5-year coefficient of variation in cash ETR, such as in McGuire et al.(2013), which measures variability in long-term performance of tax avoidance. The value relevance of accounting information in this study is modified by the Ohlson model(1995), which explains the value of the firm by using accounting information such as net assets and net income and other non-accounting information. The samples of this study are the firms listed on the securities market from 2004 to 2015 and the final samples are 3,133 firm-year. The results of this empirical analysis show that the value relevance of accounting information increases as firms have long-term and sustainable tax strategies. Most of the prior studies on tax strategies have examined the tax minimization strategy that minimizes the tax cost. However, this study is different in that the sustainability of the tax strategy affects the value relevance of accounting information. The results of this study will be useful for the users to make decision using the value relevance of accounting information.

• 환경정책연구
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• 제5권4호
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• pp.107-126
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• 2006

위협으로 뒷받침되는 강제된 자발적 협약은 정부가 원하는 재활용 목표를 최소비용으로 재활용할 수 있게 한다. 이 논문에서는 재활용에 관한 정부와 산업계의 자발적 협약을 경기(game)상황으로 이해하고 경기의 균형이 존재하는지 그리고 그 균형은 관련 산업 전체의 비용최소화를 보장하는지 검토하였다. 먼저 업계 전체를 당사자로 하여 대표인 협회와 정부 간의 쌍무 협약에 있어서 협약 참가자의 전략을 검토하고 업계의 비용최소화 전략이 Nash 균형 (SPNE)인지 여부를 판정함으로써 정부에서 기대하는 비용최소화 조건을 충족시키는지 검증하였다. 다음에는 협회와 회원 기업 간의 다자간 협약을 바탕으로 무임승차가 존재하는 경우와 그렇지 않은 경우로 나누어 개별 기업의 비용최소화 전략이 어떻게 균형을 가져오게 되는지 검토하였으며 마지막으로 이러한 이론적 분석결과가 현실의 정책평가에 어떻게 활용될 수 있는지 그 가능성을 검토하여 보았다.